David Ko, who joined the board of Audax Health in September, has been named president and COO of the Washington, D.C.-based digital health development company. He’ll be based in the company’s San Francisco office. Before Audax, Ko was COO at gaming company Zynga and he also spent a decade at Yahoo in various senior roles.

Yahoo’s board, which just met, has increased its share buyback authorization by $5 billion, a move which should keep its already Alibaba-lifted stock in place for the short term. The Silicon Valley Internet giant also said it was doing a $1 billion debt offering of convertible senior notes and that it intends to use the money for things like stock buybacks and possible acquisitions. Yahoo has been aggressively purchasing its own stock under the tenure of CEO Marissa Mayer.

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